Geoneutrinos are detected via inverse beta-decay, \(\bar{\nu _{e}}+p \longrightarrow e^{+} + n\) , with an energy threshold of \(1.806\ MeV\) . The prompt scintillation light from \(e^{+}\)  gives a measure of the \(\bar{\nu _{e}}\) -energy, \(E_{\bar{\nu _{e}}}\simeq E_{p}+ \bar{E_{n}}+0.8MeV\) , where \(E_{p}\)  is the prompt event energy including the positron kinetic and annihilation energies, and \(\bar{E}\)  is the average neutron recoil energy, \( \sigma \left(10 KeV\right)\)  [1]}. Actually, neutrinos are produced only in electron capture of \(^{40}K\) . In contrast to the Sun, Earth shines essentially in antineutrinos, ie, in geoneutrinos.
